lib: add #include "foo.h" lines like in manpages

Should help in alleviating the header mess we have atm.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/intel_chipset.c

@@ -45,6 +45,8 @@
  * @short_description: Feature macros and chipset helpers
  * @title: intel chipset
  *
+ * > #include "intel_chipset.h"
+ *
  * This library mostly provides feature macros which use raw pci device ids. It
  * also provides a few more helper functions to handle pci devices, chipset
  * detection and related issues.